2.8乘以5.6加3.4乘以2加280百分怎么简便计算?
2021-11-10 · 知道合伙人教育行家
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计算
2.8*5.6+3.4*2+280%
=2.8*5.6+2.8+3.4*2
=2.8*(5.6+1)+6.8
=2.8*6.6+6.8
=(3-0.2)*6.6+6.8
=3*6.6-0.2*6.6+6.8
=19.8-1.32+6.8
=18.48+6.8
=25.28
2.8*5.6+3.4*2+280%
=2.8*5.6+2.8+3.4*2
=2.8*(5.6+1)+6.8
=2.8*6.6+6.8
=(3-0.2)*6.6+6.8
=3*6.6-0.2*6.6+6.8
=19.8-1.32+6.8
=18.48+6.8
=25.28
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原式=2.8x5.6+3.4x2+280%
=2.8x5.6+(2.8+0.6)x2+2.8
=2.8x(5.6+2+1)+0.6x2
=2.8x8.6+1.2
=2.8x(10-1.4)+1.2
=2.8x10+1.2-2.8x(1+0.4)
=28+1.2-2.8-2.8x0.4
=28+1.2-2.8-1.12
=28-2.8+1.2-1.12
=28-2.8+0.08
=25.2+0.08
=25.28
=2.8x5.6+(2.8+0.6)x2+2.8
=2.8x(5.6+2+1)+0.6x2
=2.8x8.6+1.2
=2.8x(10-1.4)+1.2
=2.8x10+1.2-2.8x(1+0.4)
=28+1.2-2.8-2.8x0.4
=28+1.2-2.8-1.12
=28-2.8+1.2-1.12
=28-2.8+0.08
=25.2+0.08
=25.28
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280百分即280%=2.8,因此首先把第一项和第三项提取公因数2.8,再和第二项找规律,提取公因数,也可以把小数换成分数,再提取公分母后计算就简便了。
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2.8×5.6+3.4×2+280
=2×5.6+0.8×5.6+2×3.4+280
=2×(5.6+3.4)+5.6-5.6×0.2+280
=2×9+2×9+5.6-1.12+280
=302.48
=2×5.6+0.8×5.6+2×3.4+280
=2×(5.6+3.4)+5.6-5.6×0.2+280
=2×9+2×9+5.6-1.12+280
=302.48
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